先有了抗议二次吸烟的运动，然后才出现相关的证据，虽然作者对此表示好奇，但他们并不打算深究这种似乎前后颠倒的因果关系。
Though the authors note as a curiosity that campaigns against secondary smoke predated the evidence that it did any harm, they show no desire to explore this seemingly reversed causality.
运动成了他的药。活死人颠倒了因果。
His medicine is movement, the dead man alters cause and consequence.
运动成了他的药。活死人颠倒了因果。
His medicine is movement, the dead man alters cause and consequence.
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